Abstract
Arrays made from quasi-aligned nanofibers consisting of a TiC/C composite were produced directly on a titanium alloy substrate by a thermochemical process. Their morphology, structure and composition were characterized by electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The arrays were directly utilized as an electrode without further treatment and display high catalytic activity in terms of hydrazine oxidation. The low overpotential decreases gradually when increasing pH values from 5 to 10. The detection range is linear from 0.1 to 1,635 μM concentrations, and the detection limit is as low as 0.026 μM (S/N = 3). The selectivity of the electrode and its general performance and stability are very good. The improved electrochemical properties of the new electrode are attributed to the synergic effect of the highly conducting TiC nanowire core and an abundant amount of edge-plane-like defects on the carbon shells.
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Acknowledgments
This work was jointly financially supported by National Natural Science Foundation of China (50902104), City University of Hong Kong Strategic Research Grant (SRG) No. 7008009, National High Technology Research and Development Program of China No.2009AA02Z416, and Hubei Province Natural Science Foundation (No. 2010CDB03402).
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Zhang, W., Huo, K., Jiang, Y. et al. Arrays of nanofibers composed of a TiC core and a carbon coating for sensitive electrochemical detection of hydrazine. Microchim Acta 175, 137–143 (2011). https://doi.org/10.1007/s00604-011-0664-6
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DOI: https://doi.org/10.1007/s00604-011-0664-6